diff --git a/lib/charms/hpc_libs/v0/slurm_ops.py b/lib/charms/hpc_libs/v0/slurm_ops.py
index f249c96..9963bf3 100644
--- a/lib/charms/hpc_libs/v0/slurm_ops.py
+++ b/lib/charms/hpc_libs/v0/slurm_ops.py
@@ -912,9 +912,10 @@ def __init__(self, *args, **kwargs) -> None:
         self._env_manager = self._ops_manager.env_manager_for(_ServiceType.SACKD)
 
     @property
-    def config_server(self) -> str:
+    def config_server(self) -> str | None:
         """Get the configuration server address of this `sackd` node."""
-        return self._env_manager.get("SACKD_CONFIG_SERVER")
+        result = self._env_manager.get("SACKD_CONFIG_SERVER")
+        return None if result == "" else result
 
     @config_server.setter
     def config_server(self, addr: str) -> None:
@@ -971,7 +972,7 @@ def group(self) -> str:
         return "root"
 
     @property
-    def config_server(self) -> str:
+    def config_server(self) -> str | None:
         """Get the configuration server address of this `slurmd` node."""
         return self._env_manager.get("SLURMD_CONFIG_SERVER")
 
@@ -1000,7 +1001,7 @@ def __init__(self, *args, **kwargs) -> None:
         )
 
     @property
-    def mysql_unix_port(self) -> str:
+    def mysql_unix_port(self) -> str | None:
         """Get the URI of the unix socket `slurmdbd` uses to communicate with MySQL."""
         return self._env_manager.get("MYSQL_UNIX_PORT")